20850720 has 144 divisors (see below), whose sum is σ = 72394560. Its totient is φ = 5040640.

The previous prime is 20850703. The next prime is 20850737. The reversal of 20850720 is 2705802.

It is an interprime number because it is at equal distance from previous prime (20850703) and next prime (20850737).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57901 + ... + 58259.

It is an arithmetic number, because the mean of its divisors is an integer number (502740).

Almost surely, 2^20850720 is an apocalyptic number.

20850720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20850720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36197280).

20850720 is an abundant number, since it is smaller than the sum of its proper divisors (51543840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20850720 is a wasteful number, since it uses less digits than its factorization.

20850720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 20850720 is about 4566.2588625701. The cubic root of 20850720 is about 275.2371288016.

The spelling of 20850720 in words is "twenty million, eight hundred fifty thousand, seven hundred twenty".